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Update ASan information regarding --without-pymalloc flag #1609

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Jul 19, 2025
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Update ASan information regarding --without-pymalloc flag #1609

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Update ASan information regarding --without-pymalloc flag
disconnect3d Jul 19, 2025
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encukou Jul 19, 2025
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6 changes: 5 additions & 1 deletion development-tools/clang.rst
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Expand Up @@ -103,7 +103,11 @@ Then, run ``./configure`` with the relevant flags:
* ASan: ``--with-address-sanitizer --without-pymalloc``
* UBsan: ``--with-undefined-behavior-sanitizer``

It is OK to specify both sanitizers.
Disabling pymalloc for ASan helps uncover more bugs since it is more effective
with the system allocator (pymalloc doesn't add padding in between the allocated
objects and doesn't poison/annotate the memory it manages for ASan).

It is also OK to specify both sanitizers.

After that, run ``make`` and ``make test`` as usual.
Note that ``make`` itself may fail with a sanitizer failure,
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